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A brief study of bridges

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We build different bridges fordifferent needs

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Covered Bridge

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Covered Bridges

In the 18th

and 19thcentury

many bridgeswere covered

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Covered Bridges

Why do youthink these

bridges were

covered?

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Covered Bridges

Some say it

was forprotection

from a

suddenstorm

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Covered Bridges

Some say to

keep horsesfrom shyingat the sight

of ripplingwater

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Covered Bridges

Some say to

provided aromantic

setting for ahug or kiss

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Covered Bridges

However

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Covered Bridges

The realreason was

to protectthe timberfrom theeffects ofrain and

snow

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Beam Bridge

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Beam Bridge

Thesimplestand least

expensiveBeam Sometimes

called a girder

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Beam Bridge

Can bemade of

steel

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Beam Bridge

Concrete

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Beam Bridge

or evenwood

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Beam Bridge

Not the best forlong or high

spans

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Suspension Bridge

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Suspension Bridge

Betterfor

Longspans

MoreMajestic

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First suspension bridge in America

Newburyport, Mass.

Builtaround1900

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Golden Gate BridgePerhaps the most famous bridge in the world

Why is

it calledthe

GoldenGate?

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Golden Gate BridgePerhaps the most famous bridge in the world

It

spansthe

GoldenGateStrait

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No. Bridge Span (m) Country year

1 Akashi-Kaikyo 1991 Japan 1998

2 Great Belt East 1624 Denmark 1998

3 Runyang South 1490 China 2005

4 Humber 1410 UK 1981

5 Jiangyin 1385 China 1999

6 Tsing Ma 1377 China 1997

7 Verrazano-Narrows 1298 USA 19648 Golden Gate 1280 USA 1937

9 Hga Kusten 1210 Sweden 1997

10 Mackinac 1158 USA 1957

The worlds 10 longest spansare all suspension bridges

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Arch Bridge

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Arch Bridge

Very

strong

Can last avery long

time

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Arch Bridge

This is

Pont du Garda 2000 year

old Romanaqueduct

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Arch bridge

This is a

bridge built sothat a streamof water could

cross a streamof water

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Cable Stayed Bridge

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Cable Stayed bridge

Elegantstructure

Longspans

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Sunshine Skyway BridgeSt. Petersburg, FL

Requires

lessmaterial

RequiresLesslabor

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Sunshine Skyway BridgeSt. Petersburg, FL

Similarto Clarkbridge in

Alton, IL

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Lift Bridge

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Lifting Bridge

Do youknow thename of

this bridge?

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Lifting Bridge

It is notLondonBridge.

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Lifting Bridge

It is over

100 yearsold

TowerBridge

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Truss Bridge

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Truss Bridge

A truss can support from above

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Truss Bridge

A truss canalso supportfrom below

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Truss Bridge

What do youknow aboutthis bridge?

E d B id

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Eads BridgeSt. Louis, MO

Completedin 1874

Americanmasterpiece

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A quick review

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Covered Bridges

Makes use oflocal building

supplies

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Covered Bridges

Interior truss

makes itstronger than

wood beambridge

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Covered Bridges

Covering thetimbersmakes them

last longer

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Beam Bridge

Easiest

to build

Least

expensivedesign

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Cable Stay Bridge

Less

expensive tobuild thansuspension

bridges

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Cable Stay Bridges

Uses lessmaterial thansuspension

bridge

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Cable Stay Bridges

They lookcool!

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Cable Stay Bridges

Requires theuse of moremodern

materials

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Suspension Bridges

Longestunsupported

spans

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Suspension Bridges

They lookpretty cool

too!

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Arched Bridges

Strong

Durable

Ancient/low tech

building materials

Labor intensive

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Truss Bridge

Stronger

than beambridge

ThinkVectors!

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Truss Bridge

Can bridge

longerunsupported

spans than abeam bridge

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Lifting Bridge

Blockstrafic

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Lifting Bridge

Allowsthepassage

of ships

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Lifting Bridge

Ratherexpensive

Subject to

mechanicalbreakdown

Many different bridges for

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Many different bridges formany different jobs

See these websites for more

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See these websites for moreinformation on bridge design

http://www.howstuffworks.com/bridge.htm

http://www.pbs.org/wgbh/nova/bridge/

http://myron.sjsu.edu/romeweb/engineer/art2.htm

http://www.bardaglea.org.uk/bridges/welcome.html

http://education.sdsc.edu/enrich/downloadables/bridges.pdf

http://www.tfhrc.gov/pubrds/summer95/p95su23.htm

http://www.howstuffworks.com/bridge.htmhttp://www.pbs.org/wgbh/nova/bridge/http://myron.sjsu.edu/romeweb/engineer/art2.htmhttp://www.bardaglea.org.uk/bridges/welcome.htmlhttp://education.sdsc.edu/enrich/downloadables/bridges.pdfhttp://www.tfhrc.gov/pubrds/summer95/p95su23.htmhttp://www.tfhrc.gov/pubrds/summer95/p95su23.htmhttp://education.sdsc.edu/enrich/downloadables/bridges.pdfhttp://www.bardaglea.org.uk/bridges/welcome.htmlhttp://myron.sjsu.edu/romeweb/engineer/art2.htmhttp://www.pbs.org/wgbh/nova/bridge/http://www.howstuffworks.com/bridge.htm